I have faced the same issue in the past. The best workaround is discard the Asus charger and use party adapter like Samsung AFC or Ausmo. Note 18w is the maximum limit on this phone. Further, I would suggest you to buy fast charging data cable too. Ausmo makes excellent accessories which I'm currently using.
email@example.comLets see if I understand you correctly. Your phone won't charge with either of your ASUS chargers but it charges just fine with other chargers?
And charge input also I left the mobile charge at "0" percentage, after 1 and 1/2 hours time it's only 18% how long should we take to get the battery full,
I actually lost one asus6z at Jan 13 and next day I bought a new asus6z I have that much love with device I have two adopters both are at same performance and they are doing good with other brand devices using by friends and family when come my device it's literally fucking and I'm sitting at plug point to use all the time.